Telephone lock



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Patented Dec. 26, 1922.

UNITED STATES.

WILLIAM F. HEMSTREET, OF BROOKLYN, NEW YORK.

TELEPHONE LOCK.

Application filed February 16, 1921. Serial No. 445,526.

To alt/11.010772, it may concer/1..'

Be it known that I, lViLLIAu F. ,Hmr

STREET, a citizen of the United States, residing at #484 Argyle Road, in the borough of Brooklyn, in the city of New York, 1n the county ot' Kings, in the State of New York,

have invented a new and useful device to be used on an automat-ic dial-calling telephone l instrument and to be known as a Telephone Lock.

This invention relates to telephones, and more particularly to automatic dial calling telephone instruments, and has for an object the provision ot' means ,tor preventing y unauthorized use of a telephone instrument for outgoing calls.

A further object is the provision of a siniple lock for preventing the rotation of a telephone dial, and thus preventing the unauthorized transmission of a call.

A still further object is the provision of a` Fig. 5 an enlarged side elevation showing' "the dial in section.

Fig. 6 is a detail view showing the latch bar pivoted.

- Referring to the parts by numerals, 1 designates, as an entirety, a desk telephone instrument of the automatic dial calling type, 2 the base of the instrument and 3 the standard. 4 designates the dial, which is mounted to rotate upon a casing 5. The casing 5 is mounted upon thebase of the instrument and houses the contact means for making the proper connections in accordance with the mplvement of the dial when transmitting a The means for preventing the unauthorized transmission ot a call includes a casing 6. 4This casing is fast to one of the halves` 7 of a sectional clip, theother halt 8 being pivoted to the section 7 as at 9. The ends 10 of the clip halves, opposite the'pivotal connection 9, are outturned and have a bolt 11 passed therethrough. The clip halves are adapted to embrace the standard 3 of the vtelephone instrument and be trictionally held thereon against vertical or lateral displacement by tightening the nut 12 of the bolt 11. This manner of mounting the locking device upon the standard permits it to be properly adjusted with relation to the dial 4.

A latch bar 13 for locking the dial 4 against rotation is mounted for vertical movement on the upper side oi the lock casing 6. The bar 13 extends across the casing 6 and projects beyond one edge thereof.

The projecting end of said bar terminates in a depending dial-locking arm 15. The arm 15 is adapted to be engaged in one of a circular series of openings 16 'formed inthe dial 4. The latch bar 13 is formed in two sections; an outer dial-locking section a, and an inner section b, the section a being pivoted for lateral movement upon the section b as at c to facilitate the engagement of the arm 15 with the dial apertures and to permit the section a to be folded out of the way when the latch bar is unlocked. The. latch may be mounted either for direct vertical movement, or pivotally mounted at one end upon the top of the casing 6 to swing vertically.

fWhen it is desired to lock the dial 4 against rotation the latch bar 13 is pressed downwardly to engage the dial-locking arm 15 in one ot the openings 16 of the dial. Enclosed in the casing 6 is a suitable standard means (not shown) for locking the latch in its loweror dial-holding position. The

said means may be the ordmary tumbler type ot lock of simple design and adapted to be freed by the insertion of a key having a transverse contour to correspond to the shape ot an opening 31. The means for locking the latch being enclosed by the casing 6, the latch can be freed only by the possessor of a key.

What I claim is:

1. In av telephone instrument, a calling dial, unitary dial locking means, and ad'- justable means for securing said locking means to the telephone instrument to permit adjustment with reference to the dial.

2; In a telephone instrument, a standard, a calling dial, unitary dial locking means, and means carried by the dial locking means for securing' said means to the standard and for providing for vertical and lateral adjustment'thereon with reference to the dial.

A 3. In a telephone instrument, a calling dial. means t'or holding said dial against rotation. said means comprising a casing. a latch adapted to be engaged with the dial` and means enclosed in the casing tor preventing unauthorized release ot the latch from the dial.

-l. In a telephone instrument. a calling dial. means i'or holding said dial against rotation comprising a casing. adjustableI means tor securing said casing to the telephone instrument. a latch cal'ried b v tlie casing and adapted to be manually engaged with the dial. and means enclosed in the casing Jor locking the latch against unauthorized release trom the dial.

.3. ln a telephone instrument the combination ot' a standard. a calling dial` unitar \Y means tor locking the dial against unauthorized rotation` and adjustable means carried by said unitar \v locking lneaus for clamping it to the standard said clamping means permitting vertical and lateral adjustment ot' the locking means upon the standard.

(Mln a telephone instrument.. a calling dial` means tor holding said dial against rotation` said means comprising a casing, a latehadapted to be engaged with the dial. and meansv enclosed in the casing Jfor locking the latch in dial-holding position, and a removable key for releasing the said locking means.

T. In a telephone instrument. a calling dial` means tor holding said dial against rotation comprising a casing, adjustable means tor securing said casing to the telephone instrument, a latch adapted to hold the dial against, rotation, and means enclosed in the casing for locking the latch against unauthorized release.

H. ln a telephone instrument. a calling dial Jformed with a circular series of apertures. a casing, a sectional latch bar mounted for vertical movement upon the casing and adapted to be engaged in one ot' the apertures in the dial to hold the dial against rot-ation, the said latch bar comprising an inner section and an outer dial-engaging section piroted for lateral movement upon the. inner section to taeilitate its engagement with the dial apertures, and means enclosed in the casing for locking the latch bar in dial-holding position.

9. In a telephone instrument, a calling dial, means secured to the telephone instrument tor holding said dial against rotation comprising a easing, a. latch carried by the casing and adapted to be moved to lock the dial against rotation, and means enclosed in the (-.asingtor locking the latch in dial-holding position, and a removable key for releasing the said looking means.

WILLIAM F. HEMSTREET.. 

